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Nikasil is just nickel plating so silicon carbide can be embedded in the cylinder liner for wear resistance. Plating is easier to apply than depositing iron spray or casting in silicon carbide matrix into the liner or pressing in a separate liner.
The "laziest" bore hardening technique is just casting the block out of hypereutectic aluminum so the silicon precipitates form the wear surface, or casting the block out of iron.
Heat reflection is a fruitless idea, because pistons don't stay clean.
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